<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>登录</title>
    <script src="https://code.jquery.com/jquery-3.1.1.min.js"></script>
    <script type="text/javascript" src="./js/index.js"></script>
</head>
<body>
<div>用户名：<input type="text" name="username"/></div>
<div>密码：<input type="text" name="password"/></div>
<button type="button"  id="login">登录</button>
</body>
</html>